siliconmotion is an Xorg driver for Silicon Motion
based video cards. The driver is fully accelerated, and provides support
for the following framebuffer depths: 8, 16, and 24. All visual types are
supported for depth 8, and TrueColor visuals are supported for the other
depths.

Please refer to xorg.conf(5x)
for general configuration
details. This section only covers configuration details specific to this
driver. All options names are case and white space insensitive when parsed
by the server, for example, "lynxe" and "LynxE" are equivalent.

The driver
auto-detects the chipset type, but the following ChipSet names may optionally
be specified in the config file "Device" section, and will override the
auto-detection:

sets the memory clock, where integer is in kHz, and
integer <= 100000. Default: probe the memory clock value, and use it at
server start.

The following acceleration and graphics engine Options are
supported:

Option "NoAccel"

Disable acceleration. Very useful for determining
if the driver has problems with drawing and acceleration routines. This
is the first option to try if your server runs but you see graphic corruption
on the screen. Using it decreases performance, as it uses software emulation
for drawing operations the video driver can accelerate with hardware. Default:
acceleration is enabled.

Option "fifo_aggressive"

Option "fifo_moderate"

Option "fifo_conservative"

alter the settings for the threshold at which
the pixel FIFO takes over the internal memory bus to refill itself. The
smaller this threshold, the better the acceleration performance of the
card. You may try the fastest setting (fifo_aggressive) and move down if
you encounter pixel corruption. The optimal setting will probably depend
on dot-clock and on color depth. Note that specifying any of these options
will also alter other memory settings which may increase performance, so
trying fifo_conservative will in most cases be a slight benefit (this uses
the chip defaults). If pixel corruption or transient streaking is observed
during drawing operations then removing any fifo options is recommended.
Default: none.

The following PCI bus Options are supported:

Option "pci_burst"
"boolean"

will enable PCI burst mode. This should work on all but a few
broken PCI chipsets, and will increase performance. Default: off.

Option
"pci_retry" "boolean"

will allow the driver to rely on PCI Retry to program
the ViRGE registers. pci_burst must be enabled for this to work. This
will increase performance, especially for small fills/blits, because the
driver does not have to poll the ViRGE before sending it commands to make
sure it is ready. It should work on most recent PCI chipsets. Default:
off.

For assistance with this driver, or Xorg in general,
check the Xorg web site at http://www.x.org.
If you find a problem with Xorg
or have a question not answered in the FAQ please use our bug report form
available on the web site. When reporting problems with the driver send
as much detail as possible, including chipset type, a server output log,
and operating system specifics.